Brush structure



Sept. 18,1928. 8 I 1,684,855

J. M. ACHESON BRUSH STRUCTURE ,Filed Dec 12, 1927 INVENTOR,

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ATTORNEY Patented Sept. 18, 1-928.

JAMES M. ACI-IESON, 0F LOS ANGELES, CALIFORNIA.

BRUSH STRUCTURE.

Application filed December 12,1927. Serial Nam 239,571.

This invention relates to brush constructlon and especially to tooth brush structures.

Tooth brushes of usual Construction have the bristle body permanently secured-therein and in a short period of use the brushes are rendered unclean at the junction of the bristles with the brush back. ily manifest by inspection. of a tooth brush which has been repeatedly used for a few months. In such condition the brush is not sanitary, and it'is very obvious that there is no instrument of common use which should be kept cleaner than a toothbrush.

Animportant object of this invention is to provide a brush which adheres to the conventional brush body shape and. its longitudinal arrangement with the bristles extending transverse to the axis of the brush and which brush body (bristle or fiber cluster) is of unitform and is readily attachable to the brush back and removable from it at any desirable interval and replaced by a clean, new brush unit. Thus to afford a perfectly sanitary brush and to maintainhigh efliciency of the brush for cleaning purposes because the brush body can be renewed at will to present strong and straight strands as soon as an old body of brush has been beaten down by hard use. j

A. further object of the invention is to provide a tooth brush having removable and discardablebrush bodies of such low costthat they may be used but a few times and then thrown away and a fresh body applied to the back or holder, a purpose being to encourage a high degree of sanitation by affording a substantial handle and a very cheap but practicable brush unit, in quantity supply.

l.nother object is to provide a method for the production of the prepared brush units.

There are other objects, advantages and features of construction, combination and details of means as will be made manifest inthe following specification of the herewith illustrative embodiment; it being understood that modifications, variations and adaptations may be resorted to within the spirit, scope and principle of the invention as it is more directly claimed hereinafter.

Figure 1 is a brush, and

This will be readperspective of one form of the Figure 2 is a plan thereof showing the di-- vided back in open'relation. I I

Figure 3 is a cross-section of the closed back parts. i

' Figure 4 is a perspective of a brush body unit. Figure 5 isv a perspective of a clamp-bar form of the brush.

. Figure 6 is a sectional elevation thereof;

the clamp-barbeing openi 1 Figure 7 is a cross-section ofthe clamp-bar brush.

Figure 8 a plan of a carded hank of brush fibers.

Figure 9 is an edge view of the hankto show steps of unit manufacture.

The brush unit proper consists of a mat or cluster 2 of straight, .V-trough form and may be of vegetable'or animal fibers or bristles. Clean, white vegetable fiber is preferred for sanitary reasons and because of its lower cost and facility of manufacture, from raw stock, of the prepared unit. Y

A method is disclosed in Figs. 8 and 9 wherein a hank of fiber F is carded out to the desired length, width and depth. This hank is severed online 8 to produce a block ll of d sired length of strands- The strands of each block are suitably firmly tied or interbound ,medially across the block and this block can be marketed in flat form, Fig. 8, or by a suitable folding die D may be bent to an acute V-shape, Fig. 4, for market sale. The interbonding is cheaply and effectively accomplished by application of'a cross-zone of noninjurious adhesive, gum substance A on the medialline across the block of fiber. lVhile this adhesive is still soft the folding die D is thrust against the Zone of adhesive and the block of strands is molded to the desired form; the ridge or bend being made solid by the setting of the adhesive.

The V-unit is thus capable of being easily mounted and clasped in a suitable back struc ture of a brush handle 5. v I

In Figs. 1 to 3 the back includes a fixed shank 5 and a movable jaw 7 whose outer end is hinged at 8 on the shank 6. V The shank and,

the jaw have opposed, effective. clamp faces 9 which are each recessed in from one edge so to mutually form a chamber 10 on. the axis Inn of the brush or a plane thereof, to receive the folded and positioned brush unit 2. If the brush body is marketed in fiat block form ll this is medially folded for introduction into the clamping parts. The mouth of the cham-v ber 10 is narrow and its lips are designed to snugly close along the sides of the brush unit and vory firmly but removably clinch the unit in place.

VVhen the unit is inserted in the back the divergent sides of the cluster are straightened up and the strands bunched solidly ready for use. The closed jaw '2' i8 retained in cfi'ective position by any suitable means, as a slip .collar 11 movable onto a conical portion of the closed back parts; i V

' In'the form of brush shown in-Figsi 5, 6

a and 7 the shank 6 is deeply channeled'at 12 alone one side to receive the ridge of'tho folded brush unit 2 which is first laid with its valley against the inner edge of a clamp bar 13 whose outer end is hung on a pivot 14 in the outer end of the-back channel 12. \Vith the applied brush unit thebar isswung into the channel 12 and the brush unit is solidly 7 clinched in place and its exposed fibers bunched. The closed bar is retained by the o slip collar 11.

What is claimed is: i 1. A tooth brush including a handle having a shank part, a clamp member pivoted on said part and each being recessed to form a 7 chamber with a convergent mouth between opposed longitudinal faces. and a brush body unit of strands; said unit being medially I folded between the said clamping faces; the narrow mouth of the chamber closely compacting. the strands above the fold,

' 2 A tooth brush structure including a dey operative to lie in. the fold of thebrush mat and press it into the chamber; the lips of the narrow mouth compacting the bristles tight around the interposed blade;

i JAMES AoHEsoN. 

